（x²y²+1）²-4x²y²
=（x²y²）²+1+2x²y²-4x²y²
=（x²y²）²+1-2x²y²
=（x²y²-1）²
=[(xy-1)(xy+1)]²
=(xy-1)²(xy+1)²
(x方y(tǒng)方+1)的平方-4x方y(tǒng)方
(x方y(tǒng)方+1)的平方-4x方y(tǒng)方
數(shù)學(xué)人氣：683 ℃時間：2020-06-13 16:35:36
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